Malicious PDF — malware analysis report

Static analysis result for SHA-256 c293287521b0ebc9…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 06:41:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 375d624e28db241eb800e29fb98e492f SHA-1: 376af0bcfce1646c7f559a996337318667b227e4 SHA-256: c293287521b0ebc92230b8cb937e864f8f89ef8f0ee6a148fb986fd877f39147
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/free-outfits-roblox-game-hack PDF link annotation
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/hacked-robux-oh-shit-meme_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/all-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/hack-roblox-tener-nepe_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7A 23044 bytes
SHA-256: 8920141b26b798a209cd046caf319ee6a843fa7013956e487c9c5063b269f185
font_01_sfnt_off00006375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6375 19012 bytes
SHA-256: e48fd631c951fab00d942c37d27dc67f0b8596470a0e3875737a4fa2d1ea0bf7

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